# IC 21

> spiral galaxy in the constellation Cetus

**Wikidata**: [Q3715767](https://www.wikidata.org/wiki/Q3715767)  
**Source**: https://4ort.xyz/entity/ic-21


## References

1. SIMBAD
2. VizieR
3. The eleventh and twelfth data releases of the Sloan Digital Sky Survey: final data from SDSS-III
4. Gaia Data Release 2
5. The Two Micron All Sky Survey (2MASS)
6. The ninth data release of the Sloan Digital Sky Survey: first spectroscopic data from the SDSS-III baryon oscillation spectroscopic survey